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Share-based payments - Summary of number of shares in active share option plans (Details)
 12 Months Ended
Dec. 31, 2023
Option
shares
Dec. 31, 2022
Option
Performance Shares | Share option plan, granted in 2012 | Options outstanding (exercisable)    
Share-based payments    
At beginning of period   168,551
Shares lapsed   (125)
Shares exercised   (168,426)
At end of period    
Performance Shares | Share option plan, granted in 2013 | Options outstanding (not exercisable)    
Share-based payments    
Shares awarded 495 16,964
Shares vested (495) (16,964)
Performance Shares | Share option plan, granted in 2013 | Options outstanding (exercisable)    
Share-based payments    
At beginning of period 1,042,134 1,025,307
Shares lapsed (10,026)  
Shares vested 495 16,964
Shares exercised (1,032,534) (137)
At end of period 69 1,042,134
Performance Shares | Share option plan, granted in 2014 | Options outstanding (not exercisable)    
Share-based payments    
Shares awarded 14,985 19,487
Shares vested (14,985) (19,487)
Performance Shares | Share option plan, granted in 2014 | Options outstanding (exercisable)    
Share-based payments    
At beginning of period 1,196,188 1,188,070
Shares lapsed   (2)
Shares vested 14,985 19,487
Shares exercised (59,322) (11,367)
At end of period 1,151,851 1,196,188
Performance Shares | Share option plan, granted in 2015 | Options outstanding (not exercisable)    
Share-based payments    
Shares awarded 15,985 21,107
Shares vested (15,985) (21,107)
Performance Shares | Share option plan, granted in 2015 | Options outstanding (exercisable)    
Share-based payments    
At beginning of period 1,266,518 1,364,269
Shares lapsed (44)  
Shares vested 15,985 21,107
Shares exercised (31,407) (118,858)
At end of period 1,251,052 1,266,518
Performance Shares | Share option plan, granted in 2016 | Options outstanding (not exercisable)    
Share-based payments    
Shares awarded 22,192 30,808
Shares vested (22,192) (30,808)
Performance Shares | Share option plan, granted in 2016 | Options outstanding (exercisable)    
Share-based payments    
At beginning of period 1,841,196 1,942,074
Shares lapsed (91) (58)
Shares vested 22,192 30,808
Shares exercised (435,337) (131,628)
At end of period 1,427,960 1,841,196
Performance Shares | Share option plan, granted in 2017 | Options outstanding (not exercisable)    
Share-based payments    
Shares awarded 16,294 24,878
Shares vested (16,294) (24,878)
Performance Shares | Share option plan, granted in 2017 | Options outstanding (exercisable)    
Share-based payments    
At beginning of period 1,324,727 1,625,618
Shares lapsed (1,405) (1,025)
Shares vested 16,294 24,878
Shares exercised (129,684) (324,744)
At end of period 1,209,932 1,324,727
Performance Shares | Share option plan, granted in 2018 | Options outstanding (not exercisable)    
Share-based payments    
At beginning of period 14,597 891,744
Shares awarded 20,482 34,531
Shares lapsed   (5,910)
Shares vested (35,079) (905,768)
At end of period   14,597
Performance Shares | Share option plan, granted in 2018 | Options outstanding (exercisable)    
Share-based payments    
At beginning of period 1,987,868 1,538,591
Shares lapsed (7,152) (5,058)
Shares vested 35,079 905,768
Shares exercised (451,341) (451,433)
At end of period 1,564,454 1,987,868
Performance Shares | Share option plan, granted in 2019 | Options outstanding (not exercisable)    
Share-based payments    
At beginning of period 461,663 4,776,149
Shares awarded 40,825 132,345
Shares lapsed (21,670) (332,441)
Shares vested (480,818) (4,114,390)
At end of period   461,663
Performance Shares | Share option plan, granted in 2019 | Options outstanding (exercisable)    
Share-based payments    
At beginning of period 2,213,079  
Shares lapsed (3,758) (22,984)
Shares vested 480,818 4,114,390
Shares exercised (919,141) (1,878,327)
At end of period 1,770,998 2,213,079
Performance Shares | Share option plan, granted in 2020 | Options outstanding (not exercisable)    
Share-based payments    
At beginning of period 3,186,387 3,471,012
Shares awarded 68,967  
Shares lapsed (1,141,319) (284,625)
Shares vested (2,114,035)  
At end of period   3,186,387
Performance Shares | Share option plan, granted in 2020 | Options outstanding (exercisable)    
Share-based payments    
Shares vested 2,114,035  
Shares exercised (872,037)  
At end of period 1,241,998  
Performance Shares | Share option plan, granted in 2021 | Options outstanding (not exercisable)    
Share-based payments    
At beginning of period 3,797,985 4,137,673
Shares lapsed (165,786) (339,688)
At end of period 3,632,199 3,797,985
Performance Shares | Share option plan, granted in 2022 | Options outstanding (not exercisable)    
Share-based payments    
At beginning of period 4,845,900  
Shares awarded 31,248 4,964,496
Shares lapsed (205,496) (118,596)
Shares vested (5,951)  
At end of period 4,665,701 4,845,900
Performance Shares | Share option plan, granted in 2022 | Options outstanding (exercisable)    
Share-based payments    
Shares vested 5,951  
At end of period 5,951  
Performance Shares | Share option plan, granted in 2023 | Options outstanding (not exercisable)    
Share-based payments    
Shares awarded 5,876,229  
Shares lapsed (1,179,468)  
Shares vested (57,770)  
At end of period 4,638,991  
Performance Shares | Share option plan, granted in 2023 | Options outstanding (exercisable)    
Share-based payments    
Shares vested 57,770  
Shares exercised (57,770)  
Restricted Shares | Share option plan, granted in 2023 | Options outstanding (not exercisable)    
Share-based payments    
Shares awarded | shares 1,163,570  
Shares lapsed | shares (130,820)  
Shares vested | shares (21,330)  
At end of period | shares 1,011,420  
Restricted Shares | Share option plan, granted in 2023 | Options outstanding (exercisable)    
Share-based payments    
Shares vested | shares 21,330  
Shares exercised | shares (21,330)